Absorption Spectra of Inter- and Intramolecular Exciplex Systems of Pyrene and N,N-Dimethylaniline in Alcoholic Solutions

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Abstract
Absorption spectra of inter- and intramolecular exciplex systems of pyrene and N,N-dimethylaniline in alcoholic solution were obtained by means of ns laser photolysis. The spectra of intermolecular systems can be reproduced by the superposition of bands of the pyrene anion and the N,N-dimethylaniline cation. Similar results were obtained with intramolecular systems of P1 and P2, where Pn is (1-pyrenyl)-(CH2)n-(p-dimethylaminophenyl). The absorption band of P3 exciplex is structureless and very broad, the position of the maximum remaining unchanged. From the relation between absorption spectra and conformation of intramolecular systems, it is concluded that the broad band is due to the sandwich type of structure of the donor cation and the acceptor anion. Anomalous behavior of intermolecular exciplexes in alcoholic solutions is discussed on the basis of their absorption spectra.